Ergonomic arm support for a chair



FIG. 1 is a front perspective view of the ergonomic arm support for a chair showing my new design, the broken line depiction of the chair being for llustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view of the ergonmic arm support;

FIG. 3 is a front elevational view of the ergonomic arm support;

FIG. 4 is a side elevational view of the ergonomic arm support in a first position;

FIG. 5 is a bottom view of the ergonomc arm support; and,

FIG. 6 is a side elevational view of the ergonomic arm support in a second position. 

The ornamental design for an ergonmic arm support for a chair, as shown and described. 